In politics, a red–green alliance or red–green coalition is an alliance of "red" (often social-democratic or democratic socialist) parties with "green" (often green and/or occasionally agrarian) parties. The alliance is often based on common left political views, especially a shared distrust of corporate or capitalist institutions. While the "red" social-democratic parties tend to focus on the effects of capitalism on the working class, the "green" environmentalist parties tend to focus on the environmental effects of capitalism.

Red–green coalition governments

There have been a number of red–green governments in Europe since the 1990s.

Red–red–green coalition

A red–red–green coalition or red–green–red coalition is a left-wing alliance of two "red" social democratic, democratic socialist, or socialist parties with one "green" environmentalist party. In France, Jean-Luc Mélenchon's New Ecologic and Social People's Union is an example of a left–green alliance.

Radical red–green alliances

Political parties or joint electoral lists have been formed over the years, most often between socialists and left-oriented greens. Example include:

Red–green alliances with centre-left parties

There are also red/green political alliances and/or electoral agreements between social-democratic or liberal parties cooperate with green parties